Freebie Alert: Listerine Sample by Dana Zeliff on April 29, 20142014-04-29in Freebies Disclosure: This post may contain an affiliate link. Here is a nice freebie! Get a FREE sample of Listerine from Walmart plus a $3 off coupon! I love free samples like this for traveling. Make sure to read my post on 16 Other Uses for Listerine!